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https://issues.apache.org/jira/browse/HDFS-5252?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brandon Li updated HDFS-5252:
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Fix Version/s: 2.2.1
> Stable write is not handled correctly in someplace
> --------------------------------------------------
>
> Key: HDFS-5252
> URL: https://issues.apache.org/jira/browse/HDFS-5252
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: nfs
> Reporter: Brandon Li
> Assignee: Brandon Li
> Fix For: 2.2.1
>
> Attachments: HDFS-5252.001.patch, HDFS-5252.002.patch
>
>
> When the client asks for a stable write but the prerequisite writes are not
> transferred to NFS gateway, the stableness can't be honored. NFS gateway has
> to treat the write as unstable write and set the flag to UNSTABLE in the
> write response.
> One bug was found during test with Ubuntu client when copying one 1KB file.
> For small files like 1KB file, Ubuntu client does one stable write (with
> FILE_SYNC flag). However, NFS gateway missed one place
> where(OpenFileCtx#doSingleWrite) it sends response with the flag NOT updated
> to UNSTABLE.
> With this bug, the client thinks the write is on disk and thus doesn't send
> COMMIT anymore. The following test tries to read the data back and of course
> fails to do so since the data was not synced.
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